Content Comparison

Enabled

Enable (default) or disable the trending. 

When a trending is disabled:

• It does not log any values.

• Its name is displayed in italic font.

• In the Trending app / plot view, the trending name is extended by " - disabled"

• In the Metering app / calculation chart, the trending name is extended by " - disabled"

Name

Name of the trending.

Description

Trending description.

Item

Select an item from the item tree. The trending logs the values of this item.

Type

Type of the trending:

• All: All value changes of the item are logged. 

• Average: The average value of the item over a given period of time is recorded.

• COV: The value of the item is logged when it exceeds a given absolute or relative threshold.

• Delta: The difference of the current value to the previous value is recorded in intervals of the given time period. 

• Max: The maximum value of the item over a given period of time is recorded.

• Min: The minimum value of the item over a given period of time is recorded.

• Pulse: The number of received values of the item.

• Sampling: For each interval of the given time period the current value of the item is logged.

Notes:

• For items of data type String, only the trending types All and Sampling are available. (since 4.2.2010)

• Depending on the selected trending type, additional form fields may be shown.

Schedule at full hour

Enabled: The recording schedule starts at the full hour and repeats at the given interval.

Disabled: The recording schedule starts when the trending is saved or the server has been restarted and repeats at the given interval. 

Max age [days]

Trending data older that the given age in days will be deleted.

0 (default): Ignore age of data.

Interval [s]

Interval [min]

Time interval in seconds.

Time interval in minutes.

COV type

In a COV trending,

Absolute (default): Specifies the threshold as absolute value.

Percentage: Specifies the threshold as relative value.

Threshold

In a COV trending, when the threshold is exceeded then the current item value is logged.

Scaling

Disabled (default): No scaling of the item value.

Enabled: The item value is linearly scaled according to the given coefficients before being logged. Additional form fields appear.

Min-Max Validation

Disabled (default): No validation.

Enabled: Values outside the given min-max range are ignored and not logged. Additional form fields appear.

Min allowed value

Minimum value.

Max allowed value

Maximum value.

Time program

Disabled (default): Time program is disabled.

Enabled: Data is only logged during the specified period of time.

Start date/time

Start of time program.

End date/time

End of time program.

Chart

Graphical presentation of the trending data.

Range

Default time range in plot view: Day, Week, Month, Year, Custom.

Color

Color of the graph.

Decimals

Specifies the precision of values (trending and trendline) shown in table view or plot view.

Select the number of decimals to show:
0, 1 (default)

to 6,

 All

Y axis scaling

Dynamic (default): Based on the displayed values, the range of the Y axis is dynamically adjusted.

0-based: The X axis intersects the Y axis at 0.

Y axis label

Label of the Y axis.

Aggregation

Enabled (default): Values are average-aggregated in order to display a well-readable number of values, e.g. 1 value per hour in a day period.

Disabled: The recorded raw values are shown in the plot.